If your computer crashes or you inadvertently delete iTunes from your computer, it can be a frustrating experience. When you reinstall iTunes, some of your purchased music may be missing. ITunes has a policy that allows only one download of any music purchased from their store. Before you contact ITunes asking for a second download, try to manually load your purchased music.
Reinstall iTunes to your computer.
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Sign into iTunes using your previous user name and password. It is important to use the old user name; all of the songs purchased will be linked to the original user name.
Connect your iPod to the computer using the sync cable. Do not synchronize your iPod. If iTunes asks you to synchronize, decline.
Select “File” from the toolbar in iTunes. Scroll to and select “Transfer Purchases from iPod”
Locate your music in the iTunes “Store” tab under “Purchased”. Drag and drop the music back into your iPod. Synchronize your iPod.